[deliverable/linux.git] / drivers / pci / hotplug / s390_pci_hpc.c

/*
 * PCI Hot Plug Controller Driver for System z
 *
 * Copyright 2012 IBM Corp.
 *
 * Author(s):
 *   Jan Glauber <jang@linux.vnet.ibm.com>
 */

#define COMPONENT "zPCI hpc"
#define pr_fmt(fmt) COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/init.h>
#include <asm/pci_debug.h>
#include <asm/sclp.h>

#define SLOT_NAME_SIZE	10
static LIST_HEAD(s390_hotplug_slot_list);

MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
MODULE_LICENSE("GPL");

static int zpci_fn_configured(enum zpci_state state)
{
	return state == ZPCI_FN_STATE_CONFIGURED ||
	       state == ZPCI_FN_STATE_ONLINE;
}

/*
 * struct slot - slot information for each *physical* slot
 */
struct slot {
	struct list_head slot_list;
	struct hotplug_slot *hotplug_slot;
	struct zpci_dev *zdev;
};

static inline int slot_configure(struct slot *slot)
{
	int ret = sclp_pci_configure(slot->zdev->fid);

	zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
	if (!ret)
		slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;

	return ret;
}

static inline int slot_deconfigure(struct slot *slot)
{
	int ret = sclp_pci_deconfigure(slot->zdev->fid);

	zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
	if (!ret)
		slot->zdev->state = ZPCI_FN_STATE_STANDBY;

	return ret;
}

static int enable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;
	int rc;

	if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
		return -EIO;

	rc = slot_configure(slot);
	if (rc)
		return rc;

	rc = zpci_enable_device(slot->zdev);
	if (rc)
		goto out_deconfigure;

	pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
	pci_bus_add_devices(slot->zdev->bus);

	return rc;

out_deconfigure:
	slot_deconfigure(slot);
	return rc;
}

static int disable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;
	int rc;

	if (!zpci_fn_configured(slot->zdev->state))
		return -EIO;

	if (slot->zdev->pdev)
		pci_stop_and_remove_bus_device(slot->zdev->pdev);

	rc = zpci_disable_device(slot->zdev);
	if (rc)
		return rc;

	return slot_deconfigure(slot);
}

static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

	switch (slot->zdev->state) {
	case ZPCI_FN_STATE_STANDBY:
		*value = 0;
		break;
	default:
		*value = 1;
		break;
	}
	return 0;
}

static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	/* if the slot exits it always contains a function */
	*value = 1;
	return 0;
}

static void release_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot);
	kfree(slot);
}

static struct hotplug_slot_ops s390_hotplug_slot_ops = {
	.enable_slot =		enable_slot,
	.disable_slot =		disable_slot,
	.get_power_status =	get_power_status,
	.get_adapter_status =	get_adapter_status,
};

int zpci_init_slot(struct zpci_dev *zdev)
{
	struct hotplug_slot *hotplug_slot;
	struct hotplug_slot_info *info;
	char name[SLOT_NAME_SIZE];
	struct slot *slot;
	int rc;

	if (!zdev)
		return 0;

	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	if (!slot)
		goto error;

	hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
	if (!hotplug_slot)
		goto error_hp;
	hotplug_slot->private = slot;

	slot->hotplug_slot = hotplug_slot;
	slot->zdev = zdev;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		goto error_info;
	hotplug_slot->info = info;

	hotplug_slot->ops = &s390_hotplug_slot_ops;
	hotplug_slot->release = &release_slot;

	get_power_status(hotplug_slot, &info->power_status);
	get_adapter_status(hotplug_slot, &info->adapter_status);

	snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
	rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
			     ZPCI_DEVFN, name);
	if (rc)
		goto error_reg;

	list_add(&slot->slot_list, &s390_hotplug_slot_list);
	return 0;

error_reg:
	kfree(info);
error_info:
	kfree(hotplug_slot);
error_hp:
	kfree(slot);
error:
	return -ENOMEM;
}

void zpci_exit_slot(struct zpci_dev *zdev)
{
	struct list_head *tmp, *n;
	struct slot *slot;

	list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
		slot = list_entry(tmp, struct slot, slot_list);
		if (slot->zdev != zdev)
			continue;
		list_del(&slot->slot_list);
		pci_hp_deregister(slot->hotplug_slot);
	}
}
Commit	Line	Data
7441b062 JG	1	/*
	2	* PCI Hot Plug Controller Driver for System z
	3	*
	4	* Copyright 2012 IBM Corp.
	5	*
	6	* Author(s):
	7	* Jan Glauber <jang@linux.vnet.ibm.com>
	8	*/
	9
	10	#define COMPONENT "zPCI hpc"
	11	#define pr_fmt(fmt) COMPONENT ": " fmt
	12
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/slab.h>
	16	#include <linux/pci.h>
	17	#include <linux/pci_hotplug.h>
	18	#include <linux/init.h>
a2ab8333	19	#include <asm/pci_debug.h>
7441b062 JG	20	#include <asm/sclp.h>
	21
	22	#define SLOT_NAME_SIZE 10
	23	static LIST_HEAD(s390_hotplug_slot_list);
	24
	25	MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
	26	MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
	27	MODULE_LICENSE("GPL");
	28
	29	static int zpci_fn_configured(enum zpci_state state)
	30	{
	31	return state == ZPCI_FN_STATE_CONFIGURED \|\|
	32	state == ZPCI_FN_STATE_ONLINE;
	33	}
	34
	35	/*
	36	* struct slot - slot information for each physical slot
	37	*/
	38	struct slot {
	39	struct list_head slot_list;
	40	struct hotplug_slot *hotplug_slot;
	41	struct zpci_dev *zdev;
	42	};
	43
4bee2a5d SO	44	static inline int slot_configure(struct slot *slot)
	45	{
	46	int ret = sclp_pci_configure(slot->zdev->fid);
	47
	48	zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
	49	if (!ret)
	50	slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
	51
	52	return ret;
	53	}
	54
	55	static inline int slot_deconfigure(struct slot *slot)
	56	{
	57	int ret = sclp_pci_deconfigure(slot->zdev->fid);
	58
	59	zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
	60	if (!ret)
	61	slot->zdev->state = ZPCI_FN_STATE_STANDBY;
	62
	63	return ret;
	64	}
	65
7441b062 JG	66	static int enable_slot(struct hotplug_slot *hotplug_slot)
	67	{
	68	struct slot *slot = hotplug_slot->private;
	69	int rc;
	70
	71	if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
	72	return -EIO;
	73
4bee2a5d SO	74	rc = slot_configure(slot);
	75	if (rc)
	76	return rc;
	77
	78	rc = zpci_enable_device(slot->zdev);
	79	if (rc)
	80	goto out_deconfigure;
	81
4bee2a5d SO	82	pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
	83	pci_bus_add_devices(slot->zdev->bus);
	84
	85	return rc;
	86
	87	out_deconfigure:
	88	slot_deconfigure(slot);
7441b062 JG	89	return rc;
	90	}
	91
	92	static int disable_slot(struct hotplug_slot *hotplug_slot)
	93	{
	94	struct slot *slot = hotplug_slot->private;
	95	int rc;
	96
	97	if (!zpci_fn_configured(slot->zdev->state))
	98	return -EIO;
	99
8b2a7e60 SO	100	if (slot->zdev->pdev)
	101	pci_stop_and_remove_bus_device(slot->zdev->pdev);
	102
cb65a669 SO	103	rc = zpci_disable_device(slot->zdev);
	104	if (rc)
	105	return rc;
8b2a7e60	106
4bee2a5d	107	return slot_deconfigure(slot);
7441b062 JG	108	}
	109
	110	static int get_power_status(struct hotplug_slot hotplug_slot, u8 value)
	111	{
	112	struct slot *slot = hotplug_slot->private;
	113
	114	switch (slot->zdev->state) {
	115	case ZPCI_FN_STATE_STANDBY:
	116	*value = 0;
	117	break;
	118	default:
	119	*value = 1;
	120	break;
	121	}
	122	return 0;
	123	}
	124
	125	static int get_adapter_status(struct hotplug_slot hotplug_slot, u8 value)
	126	{
	127	/* if the slot exits it always contains a function */
	128	*value = 1;
	129	return 0;
	130	}
	131
	132	static void release_slot(struct hotplug_slot *hotplug_slot)
	133	{
	134	struct slot *slot = hotplug_slot->private;
	135
7441b062 JG	136	kfree(slot->hotplug_slot->info);
	137	kfree(slot->hotplug_slot);
	138	kfree(slot);
	139	}
	140
	141	static struct hotplug_slot_ops s390_hotplug_slot_ops = {
	142	.enable_slot = enable_slot,
	143	.disable_slot = disable_slot,
	144	.get_power_status = get_power_status,
	145	.get_adapter_status = get_adapter_status,
	146	};
	147
67f43f38	148	int zpci_init_slot(struct zpci_dev *zdev)
7441b062 JG	149	{
	150	struct hotplug_slot *hotplug_slot;
	151	struct hotplug_slot_info *info;
	152	char name[SLOT_NAME_SIZE];
	153	struct slot *slot;
	154	int rc;
	155
	156	if (!zdev)
	157	return 0;
	158
	159	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	160	if (!slot)
	161	goto error;
	162
	163	hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
	164	if (!hotplug_slot)
	165	goto error_hp;
	166	hotplug_slot->private = slot;
	167
	168	slot->hotplug_slot = hotplug_slot;
	169	slot->zdev = zdev;
	170
	171	info = kzalloc(sizeof(*info), GFP_KERNEL);
	172	if (!info)
	173	goto error_info;
	174	hotplug_slot->info = info;
	175
	176	hotplug_slot->ops = &s390_hotplug_slot_ops;
	177	hotplug_slot->release = &release_slot;
	178
	179	get_power_status(hotplug_slot, &info->power_status);
	180	get_adapter_status(hotplug_slot, &info->adapter_status);
	181
	182	snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
	183	rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
	184	ZPCI_DEVFN, name);
1f1dcbd4	185	if (rc)
7441b062	186	goto error_reg;
1f1dcbd4	187
7441b062 JG	188	list_add(&slot->slot_list, &s390_hotplug_slot_list);
	189	return 0;
	190
	191	error_reg:
	192	kfree(info);
	193	error_info:
	194	kfree(hotplug_slot);
	195	error_hp:
	196	kfree(slot);
	197	error:
	198	return -ENOMEM;
	199	}
	200
67f43f38	201	void zpci_exit_slot(struct zpci_dev *zdev)
7441b062 JG	202	{
	203	struct list_head tmp, n;
	204	struct slot *slot;
	205
	206	list_for_each_safe(tmp, n, &s390_hotplug_slot_list) {
	207	slot = list_entry(tmp, struct slot, slot_list);
	208	if (slot->zdev != zdev)
	209	continue;
	210	list_del(&slot->slot_list);
	211	pci_hp_deregister(slot->hotplug_slot);
	212	}
	213	}